<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>08-闰年案例</title>
  </head>
  <body>
    <script>
      function isLeapYear(year) {
        return (year % 4 === 0 && year % 100 !== 0) || year % 400 === 0
      }
    </script>
  </body>
</html>
